Malicious PDF — malware analysis report

Static analysis result for SHA-256 7749f0b87c6979d3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 11:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 934c03d7424788b5d5f2bf88a6726d46 SHA-1: d644131062bf0bb3999e19ce5d2fd563f0d41f01 SHA-256: 7749f0b87c6979d3167f32016b1c75a868e123e8155273aa4fad862d6b1c08be
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and ML classification flagging it as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing malware. The embedded URL points to a domain associated with potentially unwanted software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=rar+apk+for+android PDF link annotation
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/24633051586.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xudufifagolimazeladumabed.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/zinone.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/33457300544.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/67366846935.pdfIn PDF document text
    • https://rinducm1.com/contents/files/lazelesibupapodofezumome.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/vudefuriwomez.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/luvifutaput.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921045102836.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219144613574.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/mulujopewutakefoz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cabbc2715---67036422407.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wakolowumanunapokasapuk.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/folodibuvokudetamorej.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/17234239217.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/pomibabixalizim.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/54140660394.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa9cd4c8---69656640894.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lojon.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/75538230385.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/9357542826.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mametokepezifomazobade.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/betevijufomok.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pirox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 17368 bytes
SHA-256: 20f9cae0056ff5906e6de0ddcd9d4c9ee1c362d2a2b2180fabab39de88508d72
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10184 bytes
SHA-256: de43a7e3d6ef9aa74d8ad41446e1d6c21e34df2a7780bbdf23bbcf3d16fd6d66
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1